Gaining a greater health from Potions?

I figured it out for a mod I was making.

To get it to heal 1000 HP, go into your hex editor...

Change:
C2/4371: 40 FE

The previously-unused Item Extra Effect 0 now points to Blow Fish.

Now, go into FF3usME, and under item advanced settings, set your item's extra effect to 00.

If everything worked, your potions will heal for 1000.